Festo CAMC-G-S3 Manual page 28

2 Product description of safety module CAMC-G-S3
Input filters and logical inputs:
The digital input signals at [X40] are first filtered in the "Input Filter + Logic" function block. The block
also checks whether test pulses exist on the input signals and whether they are plausible. In the case of
two-channel inputs, a test is carried out of whether the input level corresponds to the configured input
type (equivalent / antivalent switching) and whether the signals switch at the same time.
As a result of these tests, the logical statuses of the input signals are mapped, shown in the block dia­
gram as LIN_x "Logic Inputs". For example, the signal LIN_D40 maps the logical switching status of the
two-channel input DIN40.
List of logical inputs è Section B.1.1, Tab. B.2.
Safety functions:
The safety functions have some standardised features:
Configurable logic functions are used to define which logical input signals, LINs, are switched to the
safety function for
– requesting the safety function,
– terminating the request,
– selecting additional control signals, if required.
These internal control signals for the safety functions are termed VIN_x_y "Virtual Inputs", e.g.
VIN_SS1_RSF is the term for the input for requesting (Request Safety Function) the safety function
SS1. The switching status of these signals can be read out and displayed. List of virtual outputs
è Section B.1.2, Tab. B.5.
A total of 32 product terms are available for the configuration of the switching conditions
and are comparable to a programmable logic module (PLD). The product terms can be
distributed flexibly to the desired functions.
A maximum of 4 of OR-linked product terms with a maximum of 7 inputs with/without
inversion can be used for each VIN_x_y control signal for safety and logic functions, but
also for the configuration of the VOUT_x outputs.
Virtual inputs, to which no product term has been assigned, have the logical status "0".
The following example uses two of the 32 product terms to request the STO function:
The product terms are managed automatically using the SafetyTool (a special software,
integrated in the FCT PlugIn) and are scarcely visible to the user.
28 Festo – GDCP-CAMC-G-S3-EN – 1406NH – English